We have some malleable iron wire rope clips which have broken. On the inside of the parts can be seen a dark formation. Some formations are larger than others but every broken piece has some measure of this dark formation. Does anyone have any insight into what this dark formation is? Is it rust? How does rust get into the inside (no dark formation appear on the outside of the parts) of a malleable iron casting? Could the dark formation have appeared as a result of the breakage?
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